I am kind of confused by those who hate the phrase "potty training". I don't have negative associations with the word training at all. I don't think I usually hear a parent say "I'm potty-training her", as one would train a dog (though... it just means a dog is learning when you're training them, too...) No, typically a parent would say "She's potty-training", or "We're potty-training".
To me it means the same as learning, growing, trying, improving... It's an active process the child is going through, not something you're doing to the child.
If you were in the service, you might be in basic training or fighter pilot training.
If you get a new job, you get trained on the equipment or the software.
My daughter has training wheels on her bike.
My DP is training for the Peachtree Road Race next year.
I just don't see why there's all this uproar about the word 'training.'